Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02B—HYDRAULIC ENGINEERING
  • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
  • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
  • E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
  • E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
  • E02D13/08—Removing obstacles
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02B—HYDRAULIC ENGINEERING
  • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02B—HYDRAULIC ENGINEERING
  • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
  • E02B17/0034—Maintenance, repair or inspection of offshore constructions
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
  • E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
  • E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02B—HYDRAULIC ENGINEERING
  • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
  • E02B2017/0056—Platforms with supporting legs
  • E02B2017/0073—Details of sea bottom engaging footing
  • E02B2017/0082—Spudcans, skirts or extended feet
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E10/00—Energy generation through renewable energy sources
  • Y02E10/70—Wind energy
  • Y02E10/727—Offshore wind turbines

Definitions

• the invention relates to the field of jetting for the offshore self-elevating platform of nuclear power plants, particularly to a anti-clogging jetting system for an offshore self-elevating platform.
• Self-elevating platforms in the marine industry such as fan installation platforms and oil drilling platforms, often have 3-6 liftable legs, the legs are penetrated into the seabed during elevated operating condition; the legs need to be pulled out when the platform moves. At this time, there are suction forces between the spudcan and the seabed, which makes it difficult to pull out the legs. For this reason, a jetting system is set on the legs, and high-pressure water or air is injected when the legs need to be pulled out, which destroys the vacuum and reduces the pull-out force.
• the pull-out time is only about 4 hours when the jetting system is available, and the pull-out time can reach more than 24 hours when the jetting system is unavailable. Pulling out legs for a long time will cause fatigue damage to the legs, reduce their service life, and bring potential safety hazards. Ensuring the availability of a jetting system can improve the operation efficiency, prolong the life of legs, and improve the safety of the platform.
• the owners of the oil drilling platform and fan installation platform have realized the importance of the jetting system and studied and improved the jetting system to achieve a good effect of jetting and drag reduction, reduce pull-out force, and improve operation efficiency and safety.
• the working environment of the jetting valve is seabed, which is complex and harsh, and the existing technical scheme is not ideal.
• the jetting system works in the complex geological environment on the seabed, the mud or clay on the seabed will enter the jetting system, and after a period of time, the mud or clay will solidify, and the jetting system will be seriously blocked, which will make it not available.
• the jetting system at the bottom of the spudcan Take the jetting system at the bottom of the spudcan as an example.
• the jetting main pipe passes through the spudcan upper surface to form a ring pipe, and then the ring pipe branches to each nozzle.
• the nozzle forms are as follows: the bottom of the spudcan is welded with a cylindrical plate, a hole is opened on the plate, and high-pressure water is sprayed from the hole.
• the technical problem to be solved by the invention is to provide a anti-clogging jetting system for an offshore self-elevating platform.
• the technical scheme adopted by the invention for solving the technical problems is as follows: constructing a anti-clogging jetting system for an offshore self-elevating platform, including a spudcan, a spudcan upper surface system and a spudcan lower surface system separately arranged on upper and lower sides of the spudcans, a supply system, and a spudcan main pipe connected to the supply system;
• each of the first jetting branch pipes is provided with a first maintenance valve and a first maintenance port, and the first maintenance port is located downstream of the first maintenance valve;
• Each of the second jetting branch pipes is provided with a second maintenance valve and a second maintenance port, and the second maintenance port is located downstream of the second maintenance valve.
• each of the first jetting branch pipes and each of the second jetting branch pipes are straight-through pipes.
• the first jetting valve inlcudes a first jetting valve body, a first valve core arranged in the first jetting valve body, and a first spring;
• the cross-sectional shape of the lower part of the first valve core matches the cross-sectional shape of the second receiving groove so that the lower part of the first valve core and the second receiving groove form a mechanical seal
• the upper part of the first valve core has a conical structure, the through hole is arranged in a shape matching the conical structure, and the through hole is also provided with a first sealing element.
• a plurality of first nozzles are arranged on the side wall of the second receiving groove.
• the second jetting valve inlcudes a second jetting valve body, a valve stem arranged in the second jetting valve body, a second valve core connected with the valve stem, and a second spring;
• a first accommodating groove for installing the second spring and a second accommodating groove communicating with the first accommodating groove are arranged in the second jetting valve body, and the first accommodating groove is provided with a fixing plate movably connected with the first accommodating groove, one end of the second spring is fixedly connected with the valve stem, the other end of the second spring is fixedly connected with the fixing plate, and the fixing plate is also provided with a locking piece for locking the valve stem.
• the first accommodating groove is provided with a pressure-inducing hole, and the first accommodating groove is connected with a pressure-inducing pipe through the pressure-inducing hole, one end of the pressure-inducing pipe far away from the pressure-inducing hole is connected with the outlet end of the second jetting branch pipe, and the pressure introduced by the pressure-inducing pipe is used to push the valve stem and the second valve core to move.
• the side wall of the second accommodating groove is provided with a valve body flushing port
• the valve body flushing port is connected with a flushing pipeline
• the second valve core is provided with a plurality of second nozzles connected with the flushing pipelines.
• a valve cover is arranged on the side of the second accommodating groove facing away from the first accommodating groove, and the valve cover is provided with a limiting part through which the second valve core passes.
• the second valve core is also further provided with a sealing seat which is arranged in a conical shape, the periphery of the sealing seat is provided with a second sealing element, and a limiting part is provided with a limiting wall matching the shape of the sealing seat.
• the contact between the second valve core and the limiting part is linear contact, and there is a predetermined gap between the second valve core and the limiting part.
• the sealing seat is detachably connected with the second valve core
• the valve cover is detachably connected with the second jetting valve body
• a guide hole is arranged between the first accommodating groove and the second accommodating groove, and the cross-sectional shape of the valve stem is matched with the cross-sectional shape of the guide hole, to form a mechanical seal between the valve stem and the guide hole.
• the supply system inlcudes an air bottle, a water supplier, a fire extinguisher, air pipeline, and water pipeline, wherein the air bottle is connected to the air inlet end of the air pipeline, the water supplier is connected to the water inlet end of the water pipeline, and the air outlet end of the air pipeline is merged and connected with the water outlet end of the water pipeline 45 and then connected to the inlet end of the spudcan main pipe 5.
• the anti-clogging jetting system for an offshore self-elevating platform can prevent the jetting system from being seriously blocked, and make the jetting pipeline easy to dredge so that the jetting system can be kept in an available state for a long time. Keeping the jetting system available for a long time can greatly reduce the pull-out force when pulling legs out on the offshore self-elevating platform, shorten the pull-out time, improve work efficiency, reduce the risk of strain on the legs during pull-out, and ensure the safety of the rig.
• FIG. 1 to FIG. 8 is a anti-clogging jetting system for an offshore self-elevating platform in some embodiments of the present invention. It is used to prevent the jetting system from being seriously blocked under various complex working conditions, and to dredge it quickly when it is blocked, thus ensuring that the jetting system is available for a long time.
• the anti-clogging jetting system for an offshore self-elevating platform includes a spudcan 1, a spudcan upper surface system 2 and a spudcan lower surface system 3 separately arranged on the upper and lower sides of the spudcan 1, a supply system 4, and a spudcan main pipe 5 connected to the supply system 4. It can be understood that to achieve technical purposes, different jetting valves and jetting pipelines arrangements are designed for the upper and lower surfaces of the spudcan 1.
• the spudcan upper surface system 2 includes the first connection pipelines 23, and the spudcan main pipe 5 splits into a plurality of first connection pipelines 23 at the upper surface of the spudcan 1.
• Each of the first connection pipelines 23 is connected to a plurality of first jetting branch pipes 24, and an outlet end of each of the first jetting branch pipes 24 is connected to a first jetting valve 25.
• the spudcan lower surface system 3 includes the second connection pipelines 33, and the spudcan main pipe 5 splits into a plurality of second connection pipelines 33 at the lower surface of the spudcan 1.
• Each of the second connection pipelines 33 is connected to a plurality of second jetting branch pipes 34, and an outlet end of each of the second jetting branch pipes 34 is connected to a second jetting valve 35.
• the supply system 4 includes an air bottle 41, a water supplier 42, a fire extinguisher 43, air pipeline 44, and water pipeline 45, the air bottle 41 is connected to the air inlet end of the air pipeline 44, the water supplier 42 is connected to the water inlet end of the water pipeline 45, and the air outlet end of the air pipeline 44 is merged and connected with the water outlet end of the water pipeline 45 and then connected to the inlet end of the spudcan main pipe 5.
• the air bottle 41 is used to provide air pressure for the anti-clogging jetting system for an offshore self-elevating platform
• the water supplier 42 is used to provide water for the anti-clogging jetting system for an offshore self-elevating platform
• the fire extinguisher 43 is used in emergencies.
• the triangular truss leg of the spudcan 1 is divided into three faces, namely, the AB face, the AC face, and the BC face, and the spudcan main pipe 5 is divided into three first connecting pipes 23 at the upper surface of the triangular truss leg, and each of the first connecting pipes 23 is connected to four first jetting branch pipes 24 respectively.
• the spudcan main pipe 5 is divided into three second connection pipelines 33 on the lower surface of the triangular truss leg, and each of the second connection pipelines 33 is connected to four second jetting branch pipes 34 respectively.
• the pipeline arrangement of the spudcan lower surface system 3 is basically the same as the pipeline arrangement of the spudcan upper surface system 2, and will not be described in detail here.
• the anti-clogging jetting system for an offshore self-elevating platform is equipped with special pipelines for each of the jetting valves, and each of the special pipelines is independently controlled and operated, which makes the jetting system easier to dredge.
• each of the first jetting branch pipes 24 and each of the second jetting branch pipes 34 are straight-through pipes so that each of the first jetting branch pipes 24 and each of the second jetting branch pipes 34 to avoid elbows, can directly rush to their corresponding jetting valve to complete dredging.
• each of the first jetting branch pipes 24 is provided with a first maintenance valve 241 and a first maintenance port 242, the first maintenance port 242 is located downstream of the first maintenance valve 241, and each of the second jetting branch pipes 34 is provided with a second maintenance valve 341 and a second maintenance port 342, and the second maintenance port 342 is located downstream of the second maintenance valve 341.
• the first maintenance valves 241 and the second maintenance valves 341 can both be isolation ball valves.
• the functions of the first maintenance ports 242 and the second maintenance ports 342 are as follows: once the jetting system is blocked, the corresponding blocked jetting branch pipe can be washed by a high-pressure cleaning machine, and the outlet hose of the high-pressure cleaning machine is extended into the jetting branch pipe through the maintenance port so that the mud is crushed into slurry and then flows back to the maintenance port to flow out.
• the functions of the first maintenance valves 241 and the second maintenance valves 341 are as follows: after dredging, other jetting branch pipes can be isolated by the maintenance valves, and the dredged jetting branch pipes can be washed by the high-pressure jetting pump. At the same time, the maintenance valves can also isolate the blocked jetting branch pipes, and prevent mud from entering the spudcan main pipe 5, causing a wider range of clog.
• the first jetting valve 25 includes first jetting valve body 251, a first valve core 252 arranged in the first jetting valve body 251, and a first spring 253, and the first jetting valve body 251 is provided with through hole 2511 corresponding to the outlet end of the first jetting branch pipe 24.
• the first jetting valve body 251 is internally provided with a first receiving groove 2512 located at the lower side of the through hole 2511 and a second receiving groove 2513 in communicating with the first receiving groove 2512.
• One end of the first spring 253 is fixedly connected with the first valve core 252, and the other end of the first spring 253 is fixedly connected with the bottom wall of the second receiving groove 2513.
• the first spring 253 is used for driving the first valve core 252 to be plugged and matched with the through hole 2511.
• the cross-sectional shape of the lower part of the first valve core 252 matches the cross-sectional shape of the second receiving groove 2513 so that the lower part of the first valve core 252 and the second receiving groove 2513 form a mechanical seal.
• the cross-sectional shape of the lower part of the first valve core 252 and the cross-sectional shape of the second receiving groove 2513 can be square, circular, oval, or polygonal.
• the cross-sectional shape of the lower part of the first valve core 252 and the cross-sectional shape of the second receiving groove 2513 are circular.
• the upper part of the first valve core 252 is preferably in a conical structure, and the through hole 2511 is arranged in a shape matching the conical structure, and the through hole 2511 is also provided with a first sealing element 254.
• the upper part of the first valve core 252 is sealed with the conical surface of the through hole 2511 through its conical structure, which can effectively reduce the probability that the first valve core 252 is stuck and does not rebound due to small foreign objects, and prevent muddy water from entering the corresponding first jetting branch pipe 24.
• the first sealing element 254 enhance the sealing performance between the first valve core 252 and the through hole 2511.
• the cross-sectional shape of the first receiving groove 2512 is also circular, the radius of the first receiving groove 2512 is larger than the radius of the second receiving groove 2513, and a plurality of first nozzles 255 are arranged on the side wall of the second receiving groove 2513.
• the working principle of the first jetting valve 25 is as follows: when the spudcan lower surface system 3 works, the pressure rises, pushing the first valve core 252 to compress the first spring 253, and the side wall of the second receiving groove 2513 is provided with a plurality of openings for installing the first nozzles 255 so that the fluid is ejected through the first nozzles 255 to perform jetting; when the spudcan lower surface system 3 stops, the first spring 253 rebounds, pushing the first valve core 252 and the first jetting valve body 251 to form a seal, and preventing muddy water from entering the corresponding first jetting branch pipe 24.
• some mud will inevitably enter the inner cavity of the first jetting valve body 251 during platform leg penetration, but the amount of mud entering is small, so the mud can be directly washed out by the high-pressure jetting water.
• the second jetting valve 35 includes a second jetting valve body 351, a valve stem 352 arranged in the second jetting valve body 351, a second valve core 353 connected with the valve stem 352, and a second spring 354, and the radius of the second valve core 353 is larger than the radius of the valve stem 352.
• a first accommodating groove 3511 for installing the second spring 354 and a second accommodating groove 3512 communicating with the first accommodating groove 3511 are arranged in the second jetting valve body 351, the first accommodating groove 3511 is provided with a fixing plate 3513 movably connected with the first accommodating groove 3511, one end of the second spring 354 is fixedly connected with the valve stem 352, and the other end of the second spring 354 is fixedly connected with the fixing plate 3513.
• the fixing plate 3513 is also provided with a locking piece 3514 for locking the valve stem 352.
• the fixing plate 3513 can be connected with the first accommodating groove 3511 through a guide rail or other guiding mechanisms, and the fixing plate 3513 can move along the height direction of the first accommodating groove 3511.
• the locking piece 3514 can be a locking nut.
• the first accommodating groove 3511 is provided with a pressure-inducing hole 3515, and the first accommodating groove 3511 is connected with a pressure-inducing pipe 355 through the pressure-inducing hole 3515.
• the pressure-inducing pipe 355 can be connected with the first accommodating groove 3511 through a quick joint or a welding joint, and one end of the pressure-inducing pipe 355 far away from the pressure-inducing hole 3515 is connected with the outlet end of the second jetting branch pipe 34.
• the pressure introduced by the pressure-inducing pipe 355 is used to push the valve stem 352 and the second valve core 353 to move.
• the fixing plate 3513 and the second spring 354 jointly push the valve stem 352 and the second valve core 353 to move downward.
• the pressure of the pressure-inducing pipe 355 came from the spudcan main pipe 5 is static pressure, which does not cause pressure loss to the system.
• the spring force of the second spring 354 can be set to a relatively high pressure value according to system pressure, such as 10 bar, which is favorable for overcoming the static pressure of the pipe to rebound quickly and reduce the probability of muddy water returning.
• the side wall of the second accommodating groove 3512 is provided with a valve body flushing port 35121, the valve body flushing port 35121 is connected with a flushing pipeline 356, and the second valve core 353 is provided with a plurality of second nozzles 357 connected with the flushing pipelines 356. Understandably, when the second valve core 353 move downward, the second nozzle 357 is exposed out of the spudcan 1 to spray water for jetting.
• the valve cover 358 is arranged on the side of the second accommodating groove 3512 facing away from the first accommodating groove 3511, and the valve cover 358 is provided with a limiting part 3581 through which the second valve core 353 pass.
• the second valve core 353 is further provided with a sealing seat 359 which is arranged in a conical shape. More specifically, the cross-sectional area of the sealing seat 359 gradually increases from top to bottom along its height direction.
• the periphery of the sealing seat 359 is provided with a second sealing element 360, and a limiting part 3581 is provided with a limiting wall 35811 matching the shape of the sealing seat 359.
• the seal of the second valve core 353 is sealed by the conical sealing seat 359 and the conical surface of the valve cover 358, which can effectively reduce the probability that the second valve core 353 is stuck and do not rebound due to small foreign objects.
• the smaller foreign objects may be impurities mixed in muddy water, small stones in the water, etc.
• the contact between the second valve core 353 and the limiting part 3581 is linear contact, so that the jamming probability is reduced, and there is a predetermined gap between the second valve core 353 and the limiting part 3581, and the positive pressure in the second jetting valve body 351 sprays water outwards through the predetermined gap during work, which can play a self-cleaning role.
• a guide hole 3516 is arranged between the first accommodating groove 3511 and the second accommodating groove 3512, and the cross-sectional shape of the valve stem 352 is matched with the cross-sectional shape of the guide hole 3516, to form a mechanical seal between the valve stem 352 and the guide hole 3516.
• the cross-sectional shape of the valve stem 352 and the cross-sectional shape of the guide hole 3516 are both circular in this embodiment. In other embodiments, the cross-sectional shape of the valve stem 352 and the cross-sectional shape of the guide hole 3516 may both be rectangular, triangular or other shapes, as long as the effect of forming a mechanical seal between the valve stem 352 and the guide hole 3516 is satisfied.
• the second jetting valve 35 is completely separated from the corresponding second jetting branch pipe 34 by the mechanical seal, thus reducing the failure probability.
• the sealing seat 359 is detachably connected with the second valve core 353, and the valve cover 358 is detachably connected with the second jetting valve body 351, which can be disassembled underwater and is convenient for maintenance.
• the sealing seat 359 and the second valve core 353 may be connected together by fasteners or buckles, and the valve cover 358 and the second jetting valve body 351 may also be connected together by fasteners or buckles.
• the working principle of the second jetting valve 35 is as follows: when working, the pressure rises after the spudcan lower surface system 3 is started, the second spring 354 pushes the second valve core 353 to move downwards, and the second nozzle 357 on the second valve core 353 is exposed out of the spudcan 1 to spray water for jetting; after the system is shut down, the pressure decreases, and the compressed second spring 354 rebounds, pushing the second valve core 353 upward, and the conical sealing seat 359 forms a seal with the valve cover 358 to prevent the muddy water from flowing back into the jetting valve.
• the second valve core 353 is in the seabed mud environment, a little mud will inevitably enter the second jetting valve body 351. After each pull-out, the platform is in a floating state, and the jetting pump is started to flush the second jetting valve 35.
• the second jetting valve 35 has a simple flow passage, which is beneficial for flushing mud and other impurities.
• the anti-clogging jetting system for an offshore self-elevating platform can prevent the jetting system from being seriously blocked, and make the jetting pipeline easy to dredge so that the jetting system can be kept in an available state for a long time. Keeping the jetting system available for a long time can greatly reduce the pull-out force when pulling legs out on the offshore self-elevating platform, shorten the pull-out time, improve work efficiency, reduce the risk of strain on the legs during pull-out, and ensure the safety of the rig.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Mining & Mineral Resources (AREA)
• Paleontology (AREA)
• Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
• Jet Pumps And Other Pumps (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=87500255

Family Applications (1)

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• 2023
  • 2023-06-16 CN CN202310719396.4A patent/CN116556341B/zh active Active
  • 2023-12-14 EP EP23900107.6A patent/EP4656804A1/de active Pending
  • 2023-12-14 WO PCT/CN2023/138954 patent/WO2024120539A1/zh not_active Ceased

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